[英]Unable to fetch devices from WifiP2pDeviceList
我只是在嘗試實現Wifi P2P,而我一直在獲取同行名單。 當我單擊發現設備按鈕時,我只想獲取所有設備,將設備列表附加到一個字符串即可,我可以使用文本視圖輸出該字符串。
MainActivity.java
package com.example.lrmah.wifip2p;
public class MainActivity extends AppCompatActivity implements
WifiP2pManager.PeerListListener {
private List<WifiP2pDevice> peers = new ArrayList<WifiP2pDevice>();
WifiP2pManager mManager;
WifiP2pManager.Channel mChannel;
BroadcastReceiver mReceiver;
Button B;
TextView t;
IntentFilter mIntentFilter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
t=(TextView) findViewById(R.id.displayTextView);
B=(Button) findViewById(R.id.discoverPeers);
mManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
mChannel = mManager.initialize(this, getMainLooper(), null);
mReceiver = new WiFiDirectBroadcastReceiver(mManager, mChannel, this);
mIntentFilter = new IntentFilter();
mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);
mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);
mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION);
mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);
B.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mManager.discoverPeers(mChannel, new WifiP2pManager.ActionListener() {
@Override
public void onSuccess() {
Toast.makeText(getApplicationContext(),"success",Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(int reasonCode) {
}
});
}
});
}
@Override
protected void onResume() {
super.onResume();
registerReceiver(mReceiver, mIntentFilter);
}
/* unregister the broadcast receiver */
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(mReceiver);
}
@Override
public void onPeersAvailable(WifiP2pDeviceList peerList) {
List<WifiP2pDevice> refreshedPeers = (List<WifiP2pDevice>) peerList.getDeviceList();
if (!refreshedPeers.equals(peers)) {
peers.clear();
peers.addAll(refreshedPeers);
}
WifiP2pDevice device= refreshedPeers.get(0);
t.setText(device.deviceName);
if (peers.size() == 0) {
return;
}
}}
WifiDirectBroadcastReceiver
package com.example.lrmah.wifip2p;
public class WiFiDirectBroadcastReceiver extends BroadcastReceiver {
private WifiP2pManager mManager;
private WifiP2pManager.Channel mChannel;
private MainActivity mActivity;
WifiP2pManager.PeerListListener myPeerListListener;
public WiFiDirectBroadcastReceiver(WifiP2pManager manager, WifiP2pManager.Channel channel,
MainActivity activity) {
super();
this.mManager = manager;
this.mChannel = channel;
this.mActivity = activity;
}
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION.equals(action)) {
int state = intent.getIntExtra(WifiP2pManager.EXTRA_WIFI_STATE, -1);
if (state == WifiP2pManager.WIFI_P2P_STATE_ENABLED) {
Toast.makeText(mActivity,"wifi is on",Toast.LENGTH_LONG).show();
} else {
Toast.makeText(mActivity,"Please turn on wifi",Toast.LENGTH_LONG).show();
}
} else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) {
if (mManager != null) {
mManager.requestPeers(mChannel, mActivity);
}
}
else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) {
// Respond to new connection or disconnections
} else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)) {
// Respond to this device's wifi state changing
}
}}
我可能是錯的,但我認為未調用onPeerAvailable。
一些要點:
else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) {
//您應該在這里調用
NetworkInfo networkInfo = intent.getParcelableExtra(WifiP2pManager.EXTRA_NETWORK_INFO); if (networkInfo.isConnected() && isSender) { // connected with the other device, request connection info to find group owner IP manager.requestConnectionInfo(channel, yourWifiP2pManager.ConnectionInfoListene); }
else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)) {
//在此處致電discoverPeers
manager.discoverPeers(channel, new WifiP2pManager.ActionListener() { @Override public void onSuccess() { if (manager != null) { manager.requestPeers(channel, yourWifiP2pManager.PeerListListener); } } @Override public void onFailure(int reasonCode) {} });
那么設備列表將在
else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) { WifiP2pDeviceList list = intent.getParcelableExtra(WifiP2pManager.EXTRA_P2P_DEVICE_LIST); for (WifiP2pDevice d : list.getDeviceList()) { //...
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